IOPS Network Call Establishment via Pre-stored Subscriber Mapping
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Solution Overview
Problem
In Isolated E-UTRAN Operation for Public Safety (IOPS) networks, standalone/nomadic eNodeBs lack necessary information for call establishment due to isolation from the core network, preventing them from processing user call requests within their service region.
Innovation Solution
A mobile communication device and associated systems transmit an ATTACH REQUEST message with an IOPS indicator to the service network, receive encrypted mapping information, and complete the attachment process, enabling call establishment by providing necessary assistance information through a Mobility Management Entity (MME) and Home Subscriber Server (HSS) interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standalone eNodeBs operate in isolated mode without core network connectivity, then service continuity for public safety users is maintained, but the eNodeBs cannot acquire necessary information for call establishment
Solution Approach 1:
The HSS pre-generates and stores encrypted mapping information (IMSI to MSISDN) before the isolated operation begins. When the eNodeB needs to establish a call, it can use the stored mapping information without needing real-time core network connectivity, thus resolving the contradiction between maintaining service continuity and having access to call establishment information.
Solution Approach 2:
The patent introduces an intermediary mechanism where the MME and HSS prepare and distribute mapping information to the isolated eNodeB before disconnection occurs. This intermediary preparation allows the eNodeB to function independently with the necessary information, bridging the gap between isolation requirements and information availability.
2Productivity
If the network operates in isolated mode during disasters, then public safety communication services are maintained, but the standalone eNodeBs cannot process user call requests due to lack of mapping information
Solution Approach 1:
The HSS performs preliminary actions by generating and encrypting the mapping information between IMSI and MSISDN before the isolated operation starts. This pre-prepared information is then made available to the standalone eNodeB, enabling it to process call requests independently without real-time core network access.
Solution Approach 2:
The patent creates a copy of the essential mapping information (IMSI-MSISDN relationships) and distributes it to the isolated eNodeB. This copy allows the eNodeB to function with call processing capabilities despite being disconnected from the core network, as it has a local replica of the necessary subscriber information.
Data Source
AI summary
A mobile communication device including a wireless transceiver and a controller is provided. The wireless transceiver performs wireless transmission and reception to and from a service network. The controller determines whether the service network is an Isolated E-UTRAN Operation for Public Safety (IOPS) network, and transmits a first ATTACH REQUEST message including an IOPS indicator to the service network via the wireless transceiver in response to the service network being an IOPS network. Also, the controller receives a first ATTACH ACCEPT message including encrypted mapping information from the service network via the wireless transceiver, and transmits a first ATTACH COMPLETE message to the service network via the wireless transceiver.